<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qquickanimation.cpp -->
  <title>RotationAnimation QML 类型 | Qt Quick 5.12.3</title>
  <link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
  <script type="text/javascript">
    document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
    // loading style sheet breaks anchors that were jumped to before
    // so force jumping to anchor again
    setTimeout(function() {
        var anchor = location.hash;
        // need to jump to different anchor first (e.g. none)
        location.hash = "#";
        setTimeout(function() {
            location.hash = anchor;
        }, 0);
    }, 0);
  </script>
</head>
<body>
<div class="header" id="qtdocheader">
  <div class="main">
    <div class="main-rounded">
      <div class="navigationbar">
        <table><tr>
<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtquick-index.html">Qt Quick 模块</a></td><td ><a href="qtquick-qmlmodule.html">QML类型</a></td><td >RotationAnimation QML 类型</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtquick-index.html">Qt 5.12.3 参考指南</a></td>
        </tr></table>
      </div>
    </div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar">
<div class="toc">
<h3><a name="toc">目录</a></h3>
<ul>
<li class="level1"><a href="#properties">属性</a></li>
<li class="level1"><a href="#details">详细信息</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">RotationAnimation QML 类型</h1>
<span class="subtitle"></span>
<!-- $$$RotationAnimation-brief -->
<p>Animates changes in rotation values. <a href="#details">更多...</a></p>
<!-- @@@RotationAnimation -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> 导入语句：</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr><tr><td class="memItemLeft rightAlign topAlign">继承自：</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-propertyanimation.html">PropertyAnimation</a></p>
</td></tr></table></div><ul>
<li><a href="qml-qtquick-rotationanimation-members.html">所有成员的列表，包括继承成员</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">属性</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-rotationanimation.html#direction-prop">direction</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-qtquick-rotationanimation.html#from-prop">from</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotationanimation.html#to-prop">to</a></b></b> : real</li>
</ul>
<!-- $$$RotationAnimation-description -->
<a name="details"></a>
<h2 id="details">详细信息</h2>
<p><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> is a specialized <a href="qtquick-animation-example.html#propertyanimation">PropertyAnimation</a> that gives control over the direction of rotation during an animation.</p>
<p>By default, it rotates in the direction of the numerical change; a rotation from 0 to 240 will rotate 240 degrees clockwise, while a rotation from 240 to 0 will rotate 240 degrees counterclockwise. The <a href="qml-qtquick-rotationanimation.html#direction-prop">direction</a> property can be set to specify the direction in which the rotation should occur.</p>
<p>In the following example we use <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> to animate the rotation between states via the shortest path:</p>
<pre class="qml">

  import QtQuick 2.0

  <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
      <span class="name">width</span>: <span class="number">300</span>; <span class="name">height</span>: <span class="number">300</span>

      <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
          <span class="name">id</span>: <span class="name">rect</span>
          <span class="name">width</span>: <span class="number">150</span>; <span class="name">height</span>: <span class="number">100</span>; <span class="name">anchors</span>.centerIn: <span class="name">parent</span>
          <span class="name">color</span>: <span class="string">&quot;red&quot;</span>
          <span class="name">antialiasing</span>: <span class="number">true</span>

          <span class="name">states</span>: <span class="name">State</span> {
              <span class="name">name</span>: <span class="string">&quot;rotated&quot;</span>
              <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">rect</span>; <span class="name">rotation</span>: <span class="number">180</span> }
          }

          <span class="name">transitions</span>: <span class="name">Transition</span> {
              <span class="type"><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a></span> { <span class="name">duration</span>: <span class="number">1000</span>; <span class="name">direction</span>: <span class="name">RotationAnimation</span>.<span class="name">Counterclockwise</span> }
          }
      }

      <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> { <span class="name">anchors</span>.fill: <span class="name">parent</span>; <span class="name">onClicked</span>: <span class="name">rect</span>.<span class="name">state</span> <span class="operator">=</span> <span class="string">&quot;rotated&quot;</span> }
  }

</pre>
<p>Notice the <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> did not need to set a <code>target</code> value. As a convenience, when used in a transition, <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> will rotate all properties named &quot;rotation&quot; or &quot;angle&quot;. You can override this by providing your own properties via <a href="qml-qtquick-propertyanimation.html#properties-prop">properties</a> or <a href="qml-qtquick-propertyanimation.html#property-prop">property</a>.</p>
<p>Also, note the <a href="qml-qtquick-rectangle.html">Rectangle</a> will be rotated around its default <a href="qml-qtquick-item.html#transformOrigin-prop">transformOrigin</a> (which is <code>Item.Center</code>). To use a different transform origin, set the origin in the <a href="qml-qtquick-propertychanges.html">PropertyChanges</a> object and apply the change at the start of the animation using <a href="qml-qtquick-propertyaction.html">PropertyAction</a>. See the <a href="qml-qtquick-propertyaction.html">PropertyAction</a> documentation for more details.</p>
<p>Like any other animation type, a <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> can be applied in a number of ways, including transitions, behaviors and property value sources. The <a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a> documentation shows a variety of methods for creating animations.</p>
<p><b>请参考 </b><a href="qtquick-statesanimations-animations.html">Animation 和 Transitions in Qt Quick</a> 和 <a href="qtquick-animation-example.html">Qt Quick 示例 - Animation</a>。</p>
<!-- @@@RotationAnimation -->
<h2>属性文档</h2>
<!-- $$$direction -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="direction-prop">
<td class="tblQmlPropNode"><p>
<a name="direction-prop"></a><span class="name">direction</span> : <span class="type"><a href="../qtqml/qml-enumeration.html">enumeration</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the direction of the rotation.</p>
<p>Possible values are:</p>
<ul>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Numerical (default) - Rotate by linearly interpolating between the two numbers. A rotation from 10 to 350 will rotate 340 degrees clockwise.</li>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Clockwise - Rotate clockwise between the two values</li>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Counterclockwise - Rotate counterclockwise between the two values</li>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Shortest - Rotate in the direction that produces the shortest animation path. A rotation from 10 to 350 will rotate 20 degrees counterclockwise.</li>
</ul>
</div></div><!-- @@@direction -->
<br/>
<!-- $$$from -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="from-prop">
<td class="tblQmlPropNode"><p>
<a name="from-prop"></a><span class="name">from</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the starting value for the animation.</p>
<p>For example, the following animation is not applied until the <code>angle</code> value has reached 100:</p>
<pre class="qml">

  <span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
      <span class="name">states</span>: [
          <span class="comment">// ...</span>
      ]

      <span class="name">transition</span>: <span class="name">Transition</span> {
          <span class="type"><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a></span> { <span class="name">properties</span>: <span class="string">&quot;angle&quot;</span>; <span class="name">from</span>: <span class="number">100</span>; <span class="name">duration</span>: <span class="number">2000</span> }
      }
  }

</pre>
<p>If the <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> is defined within a <a href="qmlexampletoggleswitch.html#transition">Transition</a> or <a href="qml-qtquick-behavior.html">Behavior</a>, this value defaults to the value defined in the starting state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a>, or the current value of the property at the moment the <a href="qml-qtquick-behavior.html">Behavior</a> is triggered.</p>
<p><b>请参考 </b><a href="qtquick-statesanimations-animations.html">Animation 和 Transitions in Qt Quick</a>。</p>
</div></div><!-- @@@from -->
<br/>
<!-- $$$to -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="to-prop">
<td class="tblQmlPropNode"><p>
<a name="to-prop"></a><span class="name">to</span> : <span class="type"><a href="../qtqml/qml-real.html">real</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the end value for the animation..</p>
<p>If the <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> is defined within a <a href="qmlexampletoggleswitch.html#transition">Transition</a> or <a href="qml-qtquick-behavior.html">Behavior</a>, this value defaults to the value defined in the end state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a>, or the value of the property change that triggered the <a href="qml-qtquick-behavior.html">Behavior</a>.</p>
<p><b>请参考 </b><a href="qtquick-statesanimations-animations.html">Animation 和 Transitions in Qt Quick</a>。</p>
</div></div><!-- @@@to -->
<br/>
        </div>
       </div>
   </div>
   </div>
</div>
<div class="footer">
   <p>
   <acronym title="Copyright">&copy;</acronym> 2019 The Qt Company Ltd.
   Documentation contributions included herein are the copyrights of
   their respective owners.<br/>    The documentation provided herein is licensed under the terms of the    <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation    License version 1.3</a> as published by the Free Software Foundation.<br/>    Qt and respective logos are trademarks of The Qt Company Ltd.     in Finland and/or other countries worldwide. All other trademarks are property
   of their respective owners. </p>
</div>
</body>
</html>
